I know the general meaning and use of the word "thereof" in a sentence, but I was wondering if the word could be used at the beginning of a sentence like in the following example. (I didn't find this example anywhere; I've just made it up.)
Yesterday Mary went to town to buy some flowers. Thereof I couldn't find any trace.
Since "thereof" means "of that/of which" the sentence would mean:
Yesterday Mary went to town to buy some flowers, of which I couldn't find any trace.
Now, I'm not asking if this usage is common—I know it isn't. What I want to know is whether it is grammatically correct—or shall we say permissible—if used in a literary/poetic context.